configs: Add built-in/Back mic to primary input sources

Built-in mic and Built-In Back Mic aren't in supported devices
list of primary input, so record_24 is selected if without
connecting any headset, if there is more than 2 capture
concurrency, it will fail to open input for primary input when
connecting headset in AHAL.

Add built-in mic to primary input sources to reuse input to avoid
to open extra input stream in AHAL.

CRs-fixed: 2643298
Change-Id: I1e062520f7fb03ae97c88341dd58f77177dbe030
diff --git a/configs/lahaina/audio_policy_configuration.xml b/configs/lahaina/audio_policy_configuration.xml
index b019195..bf74db4 100755
--- a/configs/lahaina/audio_policy_configuration.xml
+++ b/configs/lahaina/audio_policy_configuration.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
-<!-- Copyright (c) 2016-2019, The Linux Foundation. All rights reserved
+<!-- Copyright (c) 2016-2020, The Linux Foundation. All rights reserved
      Not a Contribution.
 -->
 <!-- Copyright (C) 2015 The Android Open Source Project
@@ -354,7 +354,7 @@
                 <route type="mix" sink="voice_rx"
                        sources="Telephony Rx"/>
                 <route type="mix" sink="primary input"
-                       sources="Wired Headset Mic,BT SCO Headset Mic,FM Tuner,Telephony Rx"/>
+                       sources="Built-In Mic,Built-In Back Mic,Wired Headset Mic,BT SCO Headset Mic,FM Tuner,Telephony Rx"/>
                 <route type="mix" sink="usb_surround_sound"
                        sources="USB Device In,USB Headset In"/>
                 <route type="mix" sink="fast input"